15 - 20% stickiness I think would actually be okay. We have to see if that is the case longer-term...
https://blog.kissmetrics.com/9-metrics/Users 1 Million +
At its peak, the social network was processing more than 30,000 signup requests an hour. It is estimated that 20% of sign ups remain active on the site one week after registration.
In October 2014, Ello reorganized itself as a benefit corporation and raised a further $5.5 million in venture capital.
At 3000 signups per day with 20% retention, Steem will require ~5 years to reach only a million uses.
It has to be able to cross the chasm from its one-degree of relation to a Blocknerd to a viral mass audience if you want to see it break out beyond Bitcoin's audience significantly.